As used in this chapter, the term "approved water supply" shall mean a water supply approved by or under the public health supervisor of a public health agency of the State of California, or its political subdivisions. In determining what constitutes an approved water supply, the county or state department of public health reserves final judgment as to its safety and potability.
(Code 1960, § 8600)
As used in this chapter, the term "cross-connection" means any unprotected connection within the premises between any part of a water system used or intended to supply water for drinking purposes and any source or system containing water or substance that is not or cannot be approved as safe, wholesome and potable for human consumption. It shall be the responsibility of the water user to provide protective devices as required elsewhere.
(Code 1960, § 8600)
The department of building safety shall enforce every provision of this chapter, except approval of the water supply; provided, however, that the health officer shall enforce such sections hereof as pertain to maintenance, use, occupancy and sanitation. The officers or agents of the department of building safety or the health officer may:
(a) 
Enter public or private property to determine whether there exists any trailer park to which this chapter applies.
(b) 
Enter and inspect all trailer parks wherever situated, and inspect all accommodations, equipment or paraphernalia used in connection therewith, including the right to examine any registers of occupants maintained therein in order to secure the enforcement of the provisions of this chapter.
(Code 1960, § 8601; Ord. No. 68-42, 12-2-68)
Each trailer park shall maintain an office in a permanent building. The owner or operator of every trailer park shall maintain in a conspicuous location in said office a copy of an approved plot plan of the trailer park. The plot plan shall show in detail the site layouts, the location of cabanas and trailers, and each site shall be designated by number or by other means of identification.
(Code 1960, § 8609)
The following are regulations to safeguard the drinking water supply by preventing backflow into public water systems. The purpose of these regulations are to protect the approved public water supply against actual or potential cross-connection or pollution of public water which may occur because of some undiscovered or unauthorized cross-connection within the premises:
(a) 
Where protection is required, each service connection from an approved public water system or supplying water to the premises of industrial, commercial, mercantile, public offices, manufacturing plants, mobile homes or mobile home parks shall be protected against backflow of water from the premises into the approved public water system.
(b) 
Type of protection.
(1) 
Approved reduced-pressure principle backflow-prevention device. The term "approved reducedpressure principle backflow-prevention device" means a device incorporating two or more check valves and an automatically operating differential relief valve located between the two checks, two shutoff valves, and equipped with necessary appurtenances for testing. The device shall operate to maintain the pressure in the zone between the two check valves less than the pressure on the public water supply side of the device. At cessation of normal flow, the pressure between the check valves shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve shall operate to maintain this reduced pressure by discharging to the atmosphere. When the inlet pressure is two pounds per square inch or less, the relief valve shall open to the atmosphere, thereby providing an air gap in the device. To be approved, these devices must be readily accessible for maintenance and testing and installed in a location where no part of the valve will be submerged.
(2) 
Approved double check valve assembly, providing this alternate is acceptable to the water purveyor, and complies with the city plumbing code and local health department requirements.
The term "approved check valve" means a check valve that seats readily and completely. It must be carefully machined to have free moving parts and assured water tightness. The face of the closure element and valve seat must be bronze, composition or other noncorrodible material which will seat tightly under all prevailing conditions of field use. Pins and bushings shall be of bronze or other noncorrodible, nonsticking material, machined for easy, dependable operation. The closure element (e.g., clapper) shall be internally weighted or otherwise internally equipped to promote rapid and positive closure in all sizes where this feature is obtainable. The term "approved double check valve assembly" means an assembly of at least two independently acting approved check valves including tightly closing shutoff valves on each side of the check valve assembly plus connections available for testing the watertightness of each check valve.
(Code 1960, § 8610)
The temporary use of trailers is subject to the zoning regulations contained in Title 13 of this Code.
(Code 1960, § 8611; Ord. No. 66-50, 11-21-66; Ord. No. 78-21, § 2, 7-17-78; Ord. No. 88-15, § 2, 10-3-88; Ord. No. 97-11, § 4, 5-5-97)
Trailer parks or mobile home parks are subject to the zoning regulations contained in Title 13 of this Code and require the approval of a conditional use permit. Application requirements and processing procedures for conditional use permits are contained in Title 13, Chapter III planning actions of this Code.
(Code 1960, § 8612; Ord. No. 68-42, 12-2-68; Ord. No. 97-11, § 5, 5-5-97)